Vision

Microgravity affects vision.

A mysterious syndrome has been
impairing astronauts' vision on the
International Space Station, causing
untreatable nearsightedness that lingers for
months even after they've returned to Earth.
The problem is so bad that two-thirds of
astronauts report having deteriorated
eyesight after spending time in orbit. Now
scientists say they finally have some
answers - and it's not looking good for our
prospects of getting to Mars. "Nobody's gone
two years with exposure to this, and the
concern is that we'd have loss of vision,"
Dorit Donoviel from the US National Space
Biomedical Research Institute told The
Guardian. "That is catastrophic for an
astronaut."

Earlier this year, NASA reported
that something in space has been messing
with its astronauts' perfect eyesight,
causing long-term impairment to their
quality of vision. Astronaut Scott Kelly,
whose exceptional vision was part of the
reason he was selected to be America's first
astronaut to spend a full year in space,
says he's been forced to wear reading
glasses since coming home. John Phillips,
who spent time on the International Space
Station (ISS) in 2005, brought his sudden
bouts of blurry vision home with him, and
during his post-flight physical, NASA
confirmed that his vision had gone from
20/20 to 20/100 in just six months. NASA
suspected that the condition - called visual
impairment inter cranial pressure syndrome,
or VIIP - was caused by the lack of gravity
in space. Science Alert, Space Could Leave You Blind, And Scientists Say They've Finally Figured Out Why, 2016

Most astronauts feel dizziness and nausea in the first few days in space
but blurred vision seems to be more lasting.

But 1400 years ago the Quran said that if
Allah opens a wormhole
for you in space you will think your vision is
intoxicated:

[Quran 15.14-15] Even if We [Allah] opened upon them from the
heaven a door and they continued passing through it they would say
'Our sights were intoxicated (سُكِّرَتْ
), rather we were bewitched'.

To Christians

[Quran 42.14-15]
They only disbanded after they received knowledge (of their Bible) fallaciously among them. And if it were not a word from your Lord [Allah] that postponed it to a later date, it would have been all settled among them then. And those who inherited the Book (the Bible) from them are in great suspicion of it. Therefore call them (to the Quran) and straighten your ways as you are ordered and don't follow their passions and say: "I believe in what Allah revealed of the Book (The Quran) and I was ordered to be just among you (both Christians and Jews); Allah is our Lord and your Lord, we have our actions and you have your actions, no argument between us and you, Allah brings us together and to Him we are (all) destined."

To Muslims

[Quran 6.108]
Do not curse those who call (to worship) other than Allah, so that they don't curse Allah out of spite and ignorance. This is how We [Allah] appealed to each people its own actions; then they will be brought back to their Lord [Allah] who will inform them of what they have been doing.